Improvement in elevated railways



1. M HANNA-HS. Elevatesd Railways. N0.l53,710. Patented Au :4,1s74.

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TiiE GRAPHIC CO, PHDTOLITH.35&+! PARK PLACE UNITED STATES PATENT OFFICE.

JAMES M. HANNAHS, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF HIS RIGHT TO CHRISTIAN AND LOUIS WAHL, OF SAME PLACE.

IMPROVEMENT IN ELEVATED RAILWAVS.

Specification forming part of Letters Patent No. 153,710, dated August 4, 1674; application tiled May 11, 1874. i

To all whom it may concern:

Be it known that I, JAMES M. HANNAHS, of the city of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Tracks for Elevated and other Railways, of which the following is a full description, reference being had to the accompanying drawings, in which- Figure 1 is a top or plan View, and Fig. 2 a longitudinal vertical section.

The object of this invention is to afford facility for the expansion and contraction of the girders or trusses and other metal work of an elevated railway; and its nature consists in securing one end of the girders or trusses to the cross-heads of columns or piers, and leaving the other end free, and holding the several sections together, as hereinafter described, by means of a central bar.

These improvements are designed to be applied to an elevated-railway track, like or similar to the one heretofore patented by me, on the 2d day of August, A. D. 1870, No. 106,056, but may be applied to other elevated railways or iron viaducts.

In the drawings, A indicates the cross-heads of columns or piers; B, the girdersor trusses; O, cross-ties, extending beyonth'the girders sufficiently far to attach lateral braces for the support and steadying of the upper portion of the girders or side guards, D, shorter crossties E, tie-bar for connecting the sections; F, grooves or projections on the cross-heads, to prevent lateral displacement of the end of section; and G, the rail.

All of the parts shown are to be made of iron or steel, except the tie-bar E, which I prefer to be of wood. It may, however, be made of iron, if desired. The sections from one column or pier to another are made to the desired length of the span, and one end is firmly attached to the cross-head of the same by bolts or other suitable means, while the other end rests upon the cross-head without being attached to it.

When in this position, I place a tie-bar, E, between the girders, as shown, and usually bolt or otherwise secure it to the cross-head A. I then bolt or secure it to two or more of the cross-ties, (usually four,) which hold the sections together. The sections are placed sufficiently far apart to admit of the usual expansion, bringing them in contact without pressure, and so that the cross-ties will be on a straight line at average temperatures. Then,l.c when the girders and section are expanded, the cross-ties, to which the bar E is secured,"

the cross-ties, substantially as set forth, and v for the purposes specified.

JAMES M. HANNAHS.

Witnesses:

L. L. BOND, 0. W. BOND. 

